Valve grinder



April 14, 1925. l E. L. sTlNN VALVE GRINDER Filed Fers. 2, A1924Patented Apr. 14, 1925.

UNITED STATES PATENT OFFICE.

EDWARD L. STINN, 0F NEOLA, IOWA.

VALVE GRINnER.

Application filed February To all fio/wm t may concern.'

'Be it known that I, EDWARD L. STINN, a citizen of the United States ofAmerica, and resident of Neola, Pottawattamie County, Iowa, haveinvented a new and useful Valve Grinder, of which theV following is aspecili'cation.

The object of this invention is to provide an improved construction fora device for Vgrinding the valves of an internal combustion engine.

A further object of this invention is to provide an improved valvegrinding device in which an oscillating lever is employed forcommunicating oscillating rotary motion to a member adapted forengagement with a valve. Y

A further object of this invention is to provide a valve-grinding devicein which provision is made for periodically permitting raising of thevalve from its seat Y through spring pressure during the grindingoperation.

A further object of this invention is to provide a valve grinding deviceadapted for actuation of valves located in normally inaccessiblelocations, sueh as beneath the dashboard of al vehicle on which theengine is mounted. v-

, drawing, in which- Figure 1 is a side elevation showing my improvedvalve grinding device in position A for practical use, a portion ,of thedevice and also portions of anengine and vehicle Vbeing shown insection.. Figure 2 is an ele `vation of one end of the device, a portionj of the handle being broken away to economize space. Figure 3 is across-section on theline 3,-3 of Figure 1. Figure 4 is a detail showinga modified forni ofroeking bar. A

In the construction of the device as shown a frame is formed of spacedside walls 10, 11 which are relatively close together throughout aportion of the length of the frame but fiare apart at their forward endsand are rigidly connected at the wider end bv a cover or top 12 rivetedthereto. The wider ends of the walls 10, 11 also are connected by ahorizontal partition 13 spacedV somewhat below the top 12, and a pinion14 2, 1924. seriai No. 690,177.

is arranged for rotary oscillation in the space between said top andpartition, being formed with journals 15, 16 on its upper and lowerends, having bearings in said top and partition respectively. A shaft17, angular in cross-section, is arranged for rotary oseillation withand vertical sliding movement relative to the pinion 14, and projectsabove the top 12 and below the partition 13. At its lower end the shaft17 carries, on a pivot 18, a cross-head 19 having diametricallyopposed,downwardly extending lugs 20 adapted for engagement in a common mannerin notches formed in the upper face of a valve 21 of the poppet type.

A handle 22 is formed on or rigidly fixed to and projects upwardly fromthe central portion of the frame, said handle being forked at its lowerend as shown in Figure 2, the legs of the forks extending into theplanes of the two walls 10, 11 of the frame. A lever 23 is arranged insubstantially vertical position at the rear or narrower end of theframe. The leverl23 also is forked at its lower end and ext-ends betweenthe walls 10, 11 and is fulcruined on a pin 24 or rivet extendingthrough said walls. A rack bar 25 is provided and extends through theforks of the handle 22 and lever 23, being pivotally connected by a pin26 to said lever near the lower end thereof. The rack bar 25 is offsetor bent downwardly between its ends and has its forward portion arnranged horizontally and extending through the space between the top 12and partition 13, being formed with a rack 27 on one face in operativeengagement with the pinion lf-l. A backing block 27 is mounted on thepai'- ti tion 13 in engagement with the rear face of the rack bar, whichis adapted for sliding movement against said block and to be heldthereby in operative lengagement with the pinion. A rocking bar 2S isarranged in substantially horizontal position above the rack bar 25 andextends through the forks of the handle 22 and lever 23, having itsforward end overlying the upner end of the squared shaft 17, which shaftpreferably is formed conical at its upper end. The rocking bar 28 isformedbetween its ends with ears 29 by means of which it is pivoted tothe handle 22, on a pin or rivet 30. The rear end portion of the rockingbar 28 extends over a pin 31 arranged across the lili) In practical usethe device is mounted on an engine blo-ch such as 32 having a valve seat33 for the valve 21, and isso positioned that the cross-head 19 overliesthe valve and the lugs20 `enter the notches thereof.

Then the lever 23 is oscillated manually, causing a reciprocation of therack bar 25 and a rotary oscillation of the pinion 14 y and with it theshaft 17 and lcross-head 19. The valve is thus caused to grind upon itsseat ina common manner, any suitable abrading substance being used` in awell known way to cause the valve to seat prop erly. During the grindingoperation the verticallyV movable shaft 17 isy held down y by pressureof the rocking bar 28, and this is lusually done against the, pressureof the valve lspring (not shown). Itis desirable to'permit or cause thevalve to be raised from its seat momentarily at intervals during thegrinding operation, andy for this purpose l have provided one or morekin-ks or recesses in the lower face of the rocking bar 28, designatedat 34.-

this instance Ihave provided two suoli recesses 84, one

at each end of the range of travel of the pinSl, so that when said pinreaches and enters said recesses upward pressure on the rear end of therocking bar is momentarily relaxed, permitting an upward movement of theshaft 17 through the pinion 14. I have also provided a light spring 8 5coiled around the projecting upper Vend of the shaft V17,-engaging atone end the upper end of the pinion and at its upper end a stop such asa flange 36y or pin carried byV said shaft, said spring actingpositively to raisethev shaft and cross-head when pressure is relaxed asjust described. Thus pressure on the valve is relaxed at intervalslduring the grinding operation, and thereuponthe valvel is raised fromits seat byv action lof' its` own spring, engagement of the cross-head;with. the valve being maintained during their siirrurltaneous upwardmovement so that vthe grinding operation is continued as soonas thepressure is again-resumed, through the rocking bar 28 and pin 31. v Byhaving twor recesses in the rocking bar the pressure: is relaxed and thevalve raised at each end of the stro-lie .of the rack bar 25 ;A but ifdesired one' of said recesses, ypreferably the one near' the outer endofthe bar, is dispensed with, so that such raising of the.. valve occursbut once in a complete oscillatory movement, and the grinding operationis more nearly continuous; This formation ofthe rocking bar 28 is shownin Figure 4. The

held in place during the grinding operation by light pressure of onehand of the operator'on the handle 22, the other hand being employed tooperate the lever 23. As the handle and operating lever are removedlaterally from the vertical plane of the grinding device, this machinemay be employed for the grinding o-f valves located in otherwiseinaccessible places, suoli as beneath the dashboard 37 of a vehicle onwhich the engine is mounted, without removing the engine from thevehicle,` as clearlyshownin Figure 1.

I claim as my invention- -1. A valve grinding tool,y comprising a frame,a pinion arranged for rotary oscillationin said frame, a shaft arrangedfor oscillation with and sliding. movement relative to said pinion, avalve-engaging member carried by the inner end of said shaft, a leverfulcruined in said. frame, a rack bar arranged for reciprocation in saidVframe and havingl aracirv in mesh with said pinion, said rack bar beingpivotally connected to said lever, a rocking bar pivotally mounted insaid frame and having one end engaging and adapted to exert pressurey onthe' outer edge of said lever, said rocking, bar entend ing acrosssa'i'd lever and engaged Vthereby to hold it in contact with said shaft;

2. A valve grinding tool, comprising a frame, a pinion arranged forrotary oseillation in said frame, a shaft arranged for' oscillation withand slidingv movement relative toV said pinion, a valveengaging` mem bercarried by the inner end of said shaft,

spring pressed means tending to hold said. shaft outwardly, a leverfulcru'med in said frame, a raclr bar arranged for reciproca'- tion andhaving a rack in mesh with said pinion, said raclr bar being pivotallyconnected with said lever, a rocking bar pivotal/ly mounted in saidframe and having one end engaging and adapted to exert press-ure on saidsla-aft against' the action of said spring-pressed means, sai-'d rockingbar extending across said lever, and a memheron said lever engaging saidrocking bar and holding .it toward' said shaft.

` 3. A. valve grinding tool, comprising a' frame, a pinion arranged. forrotary oscillation in said frame, a shaft arranged for oscillation withand sliding movement relative to said pinion, a valve-engaging membercarried bythe inner end of said shaft,- spring pressed? means forholdingsaid shaft outwardly, a lever fu'lcrumed in said frame, arack bararranged for reeiprocation and having a rack in mesh with said pinion,said r ck bar being pivota'lly connected' llO 'with said lever, arocking bar pivoted intermedlate of lts ends 1n sald frame and havmg oneend engagmg and adapted to Y exert pressure on the outer end of said yshaft, said rocking bar extending across said lever, and a member onsaid lever engaglng said rocking bar and holdlng 1t toward sald shaft,sald rocking bar being formed with a recess to receive said member attimes and permit release of pressure 011 said shaft at a Certain pointin the oscillation of said lever.

Signed at Neola, in the county of Pot tawattamie and State of Iowa, this20 day of September, 1923.

EDWARD L. STINN.

